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Mdcat-past-papers - UHS - Chemistry Quiz

Filters: Board: UHS | Subject: Chemistry |
161. An electrochemical cell is based upon which reaction?



162. Which of the following is NOT a correct feature of electrolytic cells?



163. Coinage metals Cu, Ag and Au are the least reactive because they have:



164. The standard electrode potential of hydrogen is arbitrarily taken at 298 K is:



165. The potential difference of an electrochemical cell is measured by:



166. The reaction rate in forward direction decreases with the time because:



167. In zero-order reaction, the rate is independent of:



168. For the reaction 2NO + O₂ → 2NO₂, the rate equation for the forward reaction is:



169. When the change in concentration is 6×10⁻² mol dm⁻³ and time for that change is seconds, the rate of reaction will be:



170. 2A + B → Product. If the reactant 'B' is in excess, the order of reaction with respect to 'A' in given rate R = k[A]²[B] is:



171. If the concentration-time graph of a reactant indicates a constant half-life, then the order of reaction with respect to that reactant is:



172. What is the overall order of this rate equation? Rate = k[H₂][NO₂]²



173. Identify the correct formula to calculate the rate of reaction:



174. Consider the hypothetical equation aA + bB → cC + dD. Which of the following is the correct rate equation?



175. If a reaction rate does not change with concentration then it is:



176. If a reactant/product can absorb UV, visible or IR radiation, then the rate of reaction is best measured by:



177. If rate constant k = 0.693 min⁻¹, what is the half-life for the 1st order reaction?



178. Half-life of N₂O₅ at 0°C is 24 min. How long will it take for a sample to decay to 25% of its original concentration?



179. According to collision theory of bimolecular reaction in gas phase, the minimum amount of energy required for an effective collision is known as:



180. If the energy of activation of a chemical reaction is very low, the rate of that chemical reaction is observed to be very high because:



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